Credit Risk and Concentrations (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Concentration Risk [Line Items]
Revenues	$ 2,954	$ 1,804
Revenue from Contract with Customer Benchmark \| Customer A \| Customer Concentration Risk
Concentration Risk [Line Items]
Revenues	$ 0	$ 500
Concentration risk percentage	0.00%	28.00%
Revenue from Contract with Customer Benchmark \| Customer B \| Customer Concentration Risk
Concentration Risk [Line Items]
Revenues	$ 313	$ 305
Concentration risk percentage	11.00%	17.00%

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details